<template>
  <div>
    <div class="shopcart">
      <div class="content" @click="toggleList">
        <div class="content-left">
          <div class="logo-wrapper">
            <div class="logo" :class="{'highlight':totalCount>0}">
              <i class="icon-shopping_cart" :class="{'highlight':totalCount>0}"></i>
            </div>
            <div class="num" v-show="totalCount>0">{{totalCount}}</div>
          </div>
          <div class="price" :class="{'highlight':totalPrice>0}">￥{{totalPrice}}</div>
          <div class="desc">另需配送费￥{{deliveryPrice}}元</div>
        </div>
        <div class="content-right" @click.stop="pay">
          <div class="pay" ref="pay" :class="payClass">
            {{payDesc}}
          </div>
        </div>
      </div>
      <transition
        @before-enter="beforeEnter"
        @enter="enter"
        @after-enter="afterEnter">
        <div v-show="flag" class="ball"></div>
      </transition>
      <transition name="fold">
        <div class="shopcart-list" v-show="listShow">
          <div class="list-header">
            <h1 class="title">购物车</h1>
            <span class="empty" @click="empty">清空</span>
          </div>
          <div class="list-content" ref="listContent">
            <ul>
              <li class="food" v-for="food in selectGoods">
                <span class="name">{{food.name}}</span>
                <div class="price">
                  <span>￥{{food.price*food.count}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cartcontrol :food="food"></cartcontrol>
                </div>
              </li>
            </ul>
          </div>
        </div>
      </transition>
    </div>
    <transition>
      <div class="list-mask" v-show="listShow" @click="hideList"></div>
    </transition>
  </div>
</template>

<script>
  import BScroll from 'better-scroll';
  import CartControl from 'components/cartcontrol/CartControl'

  export default {
    name: "shopcart",
    data() {
      return {
        flag: false,
        elBall: null,
        fold: true
      }
    },
    props: {
      selectGoods: {
        type: Array,
        default() {
          return [];
        }
      },
      deliveryPrice: Number,
      minPrice: Number
    },
    computed: {
      totalPrice() {
        let total = 0;
        this.selectGoods.forEach(food => {
          total += food.count * food.price;
        });
        return total;
      },
      totalCount() {
        let count = 0;
        this.selectGoods.forEach(food => {
          count += food.count;
        });
        return count;
      },
      payDesc() {
        if (this.totalPrice === 0) {
          return `￥${this.minPrice}元起送`;
        } else if (this.totalPrice < this.minPrice) {
          let dValue = this.minPrice - this.totalPrice;
          return `还需￥${dValue}元起送`;
        } else {
          return `去结算`;
        }
      },
      payClass() {
        if (this.totalPrice < this.minPrice) {
          return `not-enough`;
        } else {
          return `enough`;
        }
      },
      listShow() {
        if (!this.totalCount) {
          this.fold = true;
          return false;
        }
        let show = !this.fold;
        if (show) {
          this.$nextTick(() => {
            if (!this.scroll) {
              this.scroll = new BScroll(this.$refs.listContent, {
                click: true
              });
            } else {
              this.scroll.refresh();
            }
          })
        }
        return show;
      }
    },
    methods: {
      empty() {
        this.selectGoods.forEach(food => {
          food.count = 0;
        });
      },
      toggleList() {
        if (!this.totalCount) {
          return;
        }
        this.fold = !this.fold;
      },
      drop(el) {
        this.flag = !this.flag;
        this.elBall = el;
      },
      beforeEnter(ele) {
        let elRect = this.elBall.getBoundingClientRect();
        let x = elRect.left - 32;
        let y = -(window.innerHeight - elRect.top - 22);
        ele.style.transform = `translate3d(${x}px,${y}px,0)`;
      },
      enter(ele, done) {
        ele.offsetWidth;
        ele.style.transform = `translate3d(0,0,0)`;
        ele.style.transition = "all  0.5s cubic-bezier(.99,.37,.19,.85)";
        done();
      },
      afterEnter(ele) {
        this.flag = !this.flag;
      },
      hideList() {
        this.fold = true;
      },
      pay() {
        if (this.totalPrice < this.minPrice) {
          return;
        }
        window.alert(`支付${this.totalPrice}`)
      }
    },
    components: {
      cartcontrol: CartControl
    }

  }
</script>

<style type="text/less" lang="less" scoped>
  @import "../../common/less/mixin";

  .shopcart {
    position: fixed;
    left: 0;
    bottom: 0;
    z-index: 50;
    width: 100%;
    height: 48px;

    .content {
      display: flex;
      background-color: #141d27;
      font-size: 0;
      color: rgba(255, 255, 255, .4);

      .content-left {
        flex: 1;

        .logo-wrapper {
          display: inline-block;
          position: relative;
          top: -10px;
          margin: 0 12px;
          padding: 6px;
          width: 56px;
          height: 56px;
          box-sizing: border-box;
          vertical-align: top;
          border-radius: 50%;
          background-color: #141d27;

          .logo {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #2b343c;
            text-align: center;

            &.highlight {
              background-color: rgb(0, 160, 220);
            }

            .icon-shopping_cart {
              line-height: 44px;
              font-size: 24px;
              color: #80858a;

              &.highlight {
                color: #fff;
              }
            }
          }

          .num {
            position: absolute;
            top: 0;
            right: 0;
            width: 24px;
            height: 16px;
            line-height: 16px;
            text-align: center;
            border-radius: 16px;
            font-size: 9px;
            font-weight: 700;
            color: #fff;
            background-color: rgba(240, 20, 20);
            box-shadow: 0 4px 8px 0 rgba(0, 0, 0, .4);
          }
        }

        .price {
          display: inline-block;
          vertical-align: top;
          font-size: 16px;
          font-weight: 700;
          line-height: 24px;
          margin-top: 12px;
          padding-right: 12px;
          border-right: 1px solid rgba(255, 255, 255, .1);
          box-sizing: border-box;

          &.highlight {
            color: #fff;
          }
        }

        .desc {
          display: inline-block;
          vertical-align: top;
          line-height: 24px;
          margin: 12px 0 0 12px;
          font-size: 10px;
        }
      }

      .content-right {
        flex: 0 0 105px;
        width: 105px;

        .pay {
          height: 48px;
          line-height: 48px;
          text-align: center;
          font-size: 12px;
          font-weight: 700;

          &.not-enough {
            background-color: #2b333b;
          }

          &.enough {
            background-color: #00b43c;
            color: #fff;
          }
        }
      }
    }

    .ball {
      position: fixed;
      left: 32px;
      bottom: 22px;
      z-index: 200;
      width: 16px;
      height: 16px;
      border-radius: 50%;
      background-color: rgb(0, 160, 220);
    }

    .shopcart-list {
      position: absolute;
      top: 0;
      left: 0;
      z-index: -1;
      width: 100%;
      transform: translate3d(0, -100%, 0);

      &.fold-enter,
      &.fold-leave-to {
        opacity: 0;
        transform: translate3d(0, 0, 0);
      }

      &.fold-enter-active,
      &.fold-leave-active {
        transition: all 0.4s linear;
      }

      .list-header {
        height: 40px;
        line-height: 40px;
        padding: 0 18px;
        background-color: #f3f5f7;
        border-bottom: 1px solid rgba(7, 17, 27, .1);

        .title {
          float: left;
          font-size: 14px;
          color: rgba(7, 17, 27);
        }

        .empty {
          float: right;
          font-size: 12px;
          color: rgba(0, 160, 220);
        }
      }

      .list-content {
        padding: 0 18px;
        max-height: 217px;
        background: #fff;
        overflow: hidden;

        .food {
          position: relative;
          padding: 12px 0;
          box-sizing: border-box;
          .border-1px(rgba(7, 17, 27, .1));

          .name {
            line-height: 24px;
            font-size: 14px;
            color: rgba(7, 17, 27);
          }

          .price {
            position: absolute;
            right: 90px;
            bottom: 12px;
            line-height: 24px;
            font-size: 14px;
            font-weight: 700;
            color: rgba(240, 20, 20);
          }

          .cartcontrol-wrapper {
            position: absolute;
            bottom: 6px;
            right: 0;
          }
        }
      }
    }
  }

  .list-mask {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 40;
    backdrop-filter: blur(10px);
    background-color: rgba(7, 17, 27, .6);

    &.v-enter,
    &.v-leave-to {
      opacity: 0;
      background-color: rgba(7, 17, 27, .6);
    }

    &.v-enter-active,
    &.v-enter-active {
      transition: all 0.5s
    }
  }
</style>
